<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
        /* splice(index,howmany,params) 
        index:从那个下标开始
        howmany：修改几个参数
        params:要修改的参数的传参*/
        var arr=['html','css','javascript']
        arr.splice(1,2,"vue","react")
        console.log(arr)
    </script>
</body>
</html>                                                                     